Duplex throttle valve



May 10, 1927. 1,627,997

F. N. POIGNAND DUPLEX THROTTLE VALVE Filed April 20, 1926 2 Sheets-Sheet1 INVENTOR fi'flla 'yreand- BY 9 I S ATTORN EY 1,627,997 y 1927' F. N.POIGNAND DUPLEX THROTTLE VALVE Filed April 20. 1926 2 S heQtS-Sheet 2INVE-INTOR Pa yraznd 9 BY g ATTORNEY Patented May 10, 1927. I

UNITED STATES 1,527,997- PATENT OFFICE.

runners NESBITT rom'nann, or wEs'rr-IELn, NEW mnsmr, Assionon, BY imam:ASSIGNIENTB, 'ro SUPER-GAS CORPORATION, 01 wILnmc'roN, DELAWARE, A

CORPORATION OF DELAWARE.

' DUPLEX THROTTLE Application and April :0, me. Serial Io. 103,390.

The inain object of the present invention is to providean eflicientandreliable valve device adapted to automatically maintain a desired fluidpressure by admitting fluid from a low pressure source as it is neededand by admitting fluid from a high pressure source when the pressure ofthe fluid from the low pressure source falls below that which it isrequired to maintain.

Another objectof the invent-ion is to provide an automatic duplexthrottle valve adapted to automatically maintain a flow of steam at apredetermined, low pressure, and to receive steam for this purpose froma low pressure source and from a high pressure source. Under normalconditions the valve isv adapted to admit steam from the low pressuresource. If the pressure from thls low pressure source drops below apredeter- 2 mined point the valve is ada ted to automatically admitsuflicient high pressure steam to maintain. the desired low pressureflow. The valve is capable of adjustmentfor maintaining differentdegrees of pressure.

A further object of the invent-ion is to provide a duplex pressuremaintaining valve which is adapted to be easily adjusted for maintainingdifferent degrees of fluid pres-" sure.

Other objects of the invention will appear hereinafter.

In the drawings:

Fig. 1 is a sectional view of the valve device showing the arts in aposition to admit low pressure fluid v Fig. 2 a sectional ,vievvi';showing the operation of the valve device ,to shut off the fluiddelivery;

Fig. 3 a sectional view vice showing the-parts-in high pressure fluid;and

i i aj a d Fig. 4 a top plan viewofvtheuvalve device. Referring to thevarlousl'fparts by n m erals, the valve device com r1's'e's. a-casmg 1,

formed with an inlet cham er '2 and an out; let chamber 3. The casing isformed at one side with'a low pressure inlet 4 which leads into thechamber 2. This inlet is adapted to be connected to a source of steam orother fluid under low pressure. Atits opposite side the casing is formedwith an outlet 5 whiclrleads from the chamber 3. The outlet is adaptedto be connected with the point he valve de- 19' when t Whenthe valveiskin its lowermost the flanges'17 close the openings in t e walls atwhich the constant pressure is required. Above the inlet chamber 2 thevalve casing is formed with a vertically disposed cylinder 6 and with apassage 7 leadin downwardly from the bottom of said cylinder to thechamber 2. An inlet 0 ening 8 is formed in one side of the cylin er 6midway the height thereof. nected a supply pipe 9 which leads into theopening 8. This pipe connects with a source of steam or other fluidunder high pressure. Above the outlet chamber 3 the valve casing isformed with a vertically disposed cylinder 10 of much less hei ht thanthe cylinder 6. The lower end of t e cylinder 10 opens directlyinto thechamber 3 and its upper end is closed by an end late 11. The upper endof the larger cylinder 6 is closed by an elongated horizontal plate 12which is removabl secured at one end to the upper end of t e cylinder 6by bolts or screws 13, and ad'acent its opposite end is removably secureb bolts 14 to an upstanding bracket 15 fbrmed upon the valve casin y Aeed valve 16 is provided for controlling communication between the inletchamber 2 and the outlet chamber 3. The valve 16 is in the form of a,hollow cylinder 0 en at- -both ends and formed with outwar ly extendingperipheral flanges 17 at its ends.

I fiangesand guide them for vertical movementJflj-Formed upon; the valve16, below.

the aaa es gu are guide ribs 20 adapted to eli'gagein the guide openingsof the walls 18 v e valve is moved upwardly to carry, the flanges out ofsaid openings. In

"this positionfof thfiggglve the inlet chamber 2 is platc1411 eonmifnication with the outlet chamber 3; and tlieva'lve issaid to be open.

18 and 19 to shutoff communication between the chambers 2 and 3 and thevalve is said to be closed. The valve is centrally formed with webs 21which support an operating stem 22. The stem extends upwardly To thecasing is conosition through an opening in a horizontal wall 23 formedin the casing and spaced above the wall 18. The upper end of the stemhas a pin-and-slot pivotal connection with a lever 24 located Within theoutlet chamber 3 and fulcrumed upon an car 25 carried by the casing. Theopposite end of the lever 24 has a pin-and-slotpivotal connection withan ear 26 which depends from a pressure control piston 27 fitted withinthe short cylinder 10. The arms of the lever are of equal length.

Within the cylinder 6 is a high pressure control valve 28 formed withspaced piston heads 29 which slidably fit within the cylin der. Betweenthe under side of the valve 28 and the bottom wall of the cylinder is acoiled compression spring 30 which tends to force the valve upwardlyagainst the upper end plate 12 of the cylinder. The valve is soproportioned that in all of its vertical positions the space between itspiston heads 29 will be in communication with the high pressure inlet 8.The valve casing l is formed in one side with a passage 31. This passageleads from the cylinder 6, at a point below the inlet 8, downwardly tothe space between the horizontal walls 18 and 23, above the valve 16. Inthe upper position of the valve 28 the upper end of the passage 31 isbelow the lower piston head of the valve and is uncovered. In thelowermost position of the valve 28 its lower piston head is disposedbelow the entrance of the passage 31 and said passage is then connectedto the inlet passage 8 through the space between the piston heads 28.This is the open position of the valve.

The piston 27 is provided with an operating stem 32 which extendsupwardly through an opening in the cylinder end 11 and through a guideopening in the plate 12. The high pressure valve 28 is also providedwith an operating stem 33 which extends upwardly through an opening inthe plate 12. Formed upon the plate 12, midway between the stems 32 and33, are two spaced upstanding ears 34 having vertically extending slots35. A lever 36 is located between the cars 34 and fulcrumed upon a pin37 extending between the ears and having its ends slidably fitted in theslots 35. The arms of the lever 36mm of equal length and its oppositeends bear respectively upon the stems 32 and 33. A. lever 38 is slidablyand pivotally connected to the pin 37. This lever is forked at one endto straddle the two ears 34 and the legs 39 of the fork are formed withlongitudinally extendingslots 40 through which the projecting ends ofthe pin 37 extend. The free ends of the fork arms 39 are pivoted orfulcrumed as at 41 to an adjustable cross head 42. The cross headextends transversely across the upper surface of the plate 12 and itsopposite ends are slidably supported by guide rods 43. The rods 43 arerigidly supported slightly elevated above the plate 12 by upstandingears 44 and by a transversely extending bracket 45 carried by the plate12. An adjusting screw stem 46 extends inwardly from the bracket 45parallel to the guide rods 43 and threaded through the cross head 42.The outer end of the adjusting screw is provided with a fork 47 to whichan operating member may be connected. The screw is mounted to turnwithin a bearing opening in the bracket 45 but is held against endwisemovement. The free end of the lever 38 extends outwardly from the forkbeyond the valve casing and has a weight 47 mounted upon it.

A check valve 49 for closing the low pressure inlet is slidabl mountedupon a stem 50 supported by t 1e casing. This check valve is normallyheld open by a spring 51, and when closed against the resistance of thespring it is adapted to seat against the end of a bushing 52 fittedwithin the inlet. The valve casing is enlarged adjacent the inlet toaccommodate the check valve and the lower side of said enlarged portionis formed with a drain opening normally closed by a threaded plug 53.Directly beneath the valve 16 the lower wall of the valve casing isformed with an opening through which said valve is inserted. Thisopening is closed by a removal plate. Tapped into a threaded opening inthe casing located just above the plate 54 is a nozzle 55 normallyclosed by a cap 56. In case of a failure in the supply of fluid throughthe inlet 4 and 'the pipe 9, a supply may be admitted from anothersource through this nozzle.

Fig. 1 of the drawings shows the positions of the various parts when thecheck valve 49 and the feed valve are both open to admit fluid at lowpressure through the inlet 4; into the chamber 2, past the feed valve,into the chamber 5 and thence to the point where the fluid is needed.The hollow valve 16, the passages 7 and 31 and the space within thecylinder 6 below the valve 28, all form in effect part of the inletchamber 2. The high pressure valve 28 is therefore always subject to thepressure in the chamber 2. In Fig. 1, this pressure, combined with .thepressure of the spring 30, is holding the high pressure valve inits-upper or closed position against the resistance of the weight 48.The piston 27 which operates the feed valve is held in its lowerposition by the weight 48 acting through the levers 38 and 36 and thestem 32, and the feed valve is held open. When sufiicient pressurebuilds up in the chamber 3 to overcome the resistance of the weight thepiston 27 is forced up to rock the lever 24 and move the feed valve 16down to closed position as shown in Fig. 2. Upon a drop in pressurewithin the chamber 3 the weight 48 will automatically again move thepiston down to reopen the feed valve 16 and re-build the pressure.

iii)

memo? If the pressure su lied through the low pressure inlet 4 shou ddrop below the pressure required in chamber 3, the welght 48 willovercome the diminished pressure in the cylinder 6 and the resistance ofthe spring 30 and force the high pressure valve 28 down to open positionas shown in Fig. 3. High pressure fluid then enters the cylinder 6,between the iston heads 29 of the valve, flows through t e passage 31into the chamber 2 and past the feed valve 16' to the constant pressurechamber 3. lVhen the pressure builds up sufliciently the piston 27closes the feed valve against the weight resistance and retains thehigh'pressure in the v chamber 2. When the high pressure fluidfirstenters the chamber 2 it immediately closes the check valve 49 andprevents the fluid from escaping through the low pres sure inlet 4.

The weight 48 and the ad ustment of the lever 38 determine the degree ofpressure maintained in the chamber 3. By shifting the cross head 42inwardly the lever 38 is moved longitudinally and its fulcrum is movedinwardly toward the pin 37, which is the point of load application. Themechanical advantage of the weight is increased by this adjustmentand itwill resist a greater fluid pressure upon the valves. To maintain alower pressure the cross head 42 is moved outwardly to slide the leverover the pin and shift the fulcrum away from the point of loadapplication. The levers are so designed and arranged as to render itextremely easy to make these ad ustments. The adjustment may bemade froma point located a considerable distance from the valve by means of areach rod or other connection with the adjusting screw 46 of the fulcrumcross head. \Vhat I claim is:

l. A valve casing formed with an inlet chamber and an outlet chamber,the inlet chamber being provided with a low-pressure inlet and with ahigh-pressure inlet; a feed valve controlling communication between saidtwo chambers; means operating to close the feed valve when apredetermined degreeof fluid pressure is in the outlet chamber; ahigh-pressure valve controlling communication between the high-pressureinlet and the inlet chamber; and means to impose equal pressures on thefeed valve and on the high-pressure valve tendin'gto open said valves,said pressure-imposing means opening the high-pressure valve and thefeed valve when" the pressures in the two chambers fall below thevalve-opening pressure.

2. A valve casing formed with an inlet chamber and an outlet chamber,the inlet chamber being provided with a low-pressure inlet and wlth ahigh-pressure inlet; a feed valve controlling communication between saidtwo chambers; means operating to close the feed valve when apredetermined degree the inlet chamber; means to impose equal pressureson the feed valve and on the highpressure valve tending to open saidvalves,

'srid pressure-imposingmeans opening the high-pressure valve and thefeed valve when the pressures in the two chambers fall below thevalve-opening pressure; and adjustable 'means for varying thevalve-opening pressure.

A valve casing formed with an inlet chamber and an outlet chamber theinlet chamber being provided with a low pressure fluid inlet; a feedvalve controlling communication between said two chambers, a highpressure fluid connection; a valve adapted to be opened to supply highpressure fluid from said connection to the outlet chamber; means toautomatically close the feed valve when a predetermined fluid pressureis built up in the outlet chamber; weighted means tending to open bothof said valves, the opening of the valvesbeing resisted by the fluidpressure in the valve casing; and a check valve adapted to prevent theescape of high pressure fluid through the --lo\v pressure inlet; thesaid weighted means being adapted to open'the high pressure valve whenthe pressure in the outlet chamber falls below the pressure at which thefeed. valve is opened.

Hill

' 4. A valve casing formed with an inlet chamber and an outlet chamber,the inlet chamber being provided with a low pressure inlet; a normallyopen feed valve controlling communication between said two chambers;means operated by the fluid pressure in the outlet chamber toautomatically close the feed valve when said pressure reaches a certaindegree; a high pressure fluid sup ply connection; a high pressure valvecontrolling communication between said sup ply connection and the inletchamber; mean's tending constantly to open both of said valves, theopening of the valves being resisted by the fluid pressure in the inletand outlet chambers and the said valve opening chamber being providedwith a low pressure fluid inlet; a feel valve to control communicationbetween said two chambers; means operated by the fluid pressure in theoutlet chamber to close the said feed valve when said pressure reaches acertain point;

a high pressure fluid supply connection; a

high pressure. valve adapted tobe opened to supply fluid from saidconnection to the outlet chamber; a weighted lever havlng a shiftablefulcrum; operative connections be-' tween the lever and the said twovalves casing and the lever being adapted to open the high pressurevalve when the pressure p in the outlet chamber falls a predetermineddegree below the pressure at which the-feed valveis opened; and meansadapted to prevent an escape of high the low pressure inlet.

6. A valve casing; two valves within said casing adapted to control theadmission of fluid from diflerent sources and provided pressure fluidthrough with upwardly extending perating stems;

a floating lever of the first class having its opposite ends operativelyengaging said valve stems; a fulcrum mounting for the lever adapted topermit vertical shifting of the fulcrum; a valve-opening lever of thesecond class; a sluftable fulcrum mounting for the valve 0 enin lever aload connection between the valve-opening lever and the fulcrum of thefloating lever adapted to permit the valve-opening lever to slide tosaid fulcrum; free end of the longitudinally relatively a. .weightcarried by tie valve opening lever; and adjustment means to shift thefulcrum of the valve opening lever and slide the lever across thefulcrum of the floating lever to vary the mechanical advantage oftheweight, the said weight tending to depress the two levers against therdsistance of fluid pressure within: the valve casing and thefloatinglever adapting saidvalves to be opened independently ofeachiother against the weight resistance.

7. A valve casing formed with an inlet chamber and an outletcha-mber,the inlet chamber being provided with a low-pressure inlet andwith a high-pressure inlet; a feed valve controlling communication between said two chambers; means operating to close the feed valve when apredetermined degree of fluid pressure is in the outlet chamber; ahigh-pressure valve controlling communication between the high-pressureinlet and the inlet chamber; and means toimpose equal on thehigh-pressure valve tending to open said valves, the pressure tending toopen the feed valve be ng o posed by the pres sure in the outlet cham erand the pressure tending to open the high pressure valve being opposedby the pressure in the inlet pressures on the feed valve and chamber,said pressure-imposing means opening the feed valve when the pressure inthe outlet chamber is belowthe valveopening pressure and opening thehigh-pres surevalve when the pressure in' the inlet chamber is below thevalve-opening pressure. a

8. A valve casing formed with an inlet controlling communication betweenthe highpres sureinlet and the inlet chamber; and, means to imposepressures on the feed valve and on the high-pressure valve tending toopen said valves, the pressure tending to open the feed valve beingopposed by the pressure in the outlet chamber and the pressure tendingto open the high-pressure valve being opposed by the pressure in theinlet chamber, said pressure-imposing means opening the feed valve whenthe pressure in the outlet chamber is below the valveopening pressureand opening the high-pressure valve when the pressure in the inletchamber is below the valve-opening pressure.-

'9. A valve casing formed -with an inlet chamber and an outlet'chamber,the inlet chamber being provided with a low-pressure inlet and with ahigh-pressure inlet; a feed valve controlling communication between saidtwo chambers; means operating to close the feed valve when apredetermined degree of fluid pressure is in the outlet chamber; ahigh-pressurevalve controlling communication between the high-pressureinlet and the inlet chamber; means to impose equal pressures on the feedvalve andon the high-pressure valve tending to open said valves, thepressure tending to open the feed valve being opposed by the pressure inthe outlet chamber and the pressure tending to open the high-pressurevalve being opposed by the pressure in the inlet chamber, saidpressure-imposing means opening the feed valve whenthe pressure in theoutlet chamber is' below the valve-opening pressure and opening thehigh-pressure valve when the pressure in the'inlet chamber is below thevalve-opening pressure; and adjustable means for varying thevalveopening pressure.

10. A valve casing formed with an'jnlet chamber and an outlet chamber,the inlet chamber being provided'with a low-pressure inlet and withvalve controlling communication between said two chambers; meansoperating to close the feed valve when a predetermined degree of fluidpressure is in the outlet chamber;

a high-pressure inlet; a feed a high-pressure valve controllingcommunication between the high pressure inlet and the inlet chamber;means to impose equal pressures on the feed valve and on thehighpressure valve tending to open said valves, the pressure tending toopen the feed valve being opposed by the pressure in the outlet chamberand the pressure tending to open the high-pressure valve being opposedby the pressure in the inlet chamber, said pressure-imposing meansopening the feed valve when the pressure in the outlet chamber is belowthe valve-opening pressure and opening the high-pressure valve when thepressure in the inlet chamber is below the valve-opening, pressure; andmeans whereby the valves may move to open and closed positionsindependently of each other and in response to variations of pressuresin the said two chambers.

In testimony whereof I hereunto aflix my signature.

FRANCIS NESBITT POIGNAND.

